Ring and Ball Apparatus Laboratory Equipment for Flash & Fire Point Testing, Petroleum & Oil Analysis High-Precision Scientific Instrument for Chemistry Labs Copper Wire for Electrical Needs Control: Two Knobs (Stirring Speed
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Ring and Ball Apparatus Laboratory Equipment for Flash & Fire Point Testing, Petroleum & Oil Analysis High Precision Scientific Instrument for Chemistry Labs Copper Wire for Electrical Needs Control: Two Knobs (Stirring Speed Control: Two Knobs (Stirring Speed & Heating) divided into 1